If you're modest, think twice before having sex in your van, truck, or RV. Law enforcement uses roving vans with backscatter X-ray technology to peer inside vehicles (the same technology used in airport body scanners). In the Land of the Free, authorities don't request search warrants. More at Forbes here and here. What, you don't want an X-ray bath?

My big worry i guess would be if they are recording, and where does this data go and for how long? I'd hate to see some hacker group (black or white hat) getting a hold of (hundreds of?) thousands of videos of private citizens going at it (or other activities not illegal, but maybe frowned upon), and releasing it on the net. While it would be super funny, it would also suck for those involved, and quite possibly be costly (as in lawsuits) for the government and by proxy, tax payers...